On the cover: N-type voltage-dependent calcium channel (VDCC) on periarterial sympathetic nerves. A, Sympathetic nerves were colabeled with an antityrosine hydroxylase (TH) antibody and an anti-α1B calcium channel (N-type calcium channel) subunit antibody. Immunoreactivity for TH and N-type calcium channels (B) were observed in periarterial nerves (arrows). C, Overlay of photomicrographs in A and B showing colocalization (yellow labeling) of TH and N-type calcium channels. (See page 326.)